Personal Communications Response

Personal Communications returns the list of system topic data items in CF_TEXT format in a DDE DATA message. 
WM_DDE_DATA(hData, aSYSITEMS)
The following data items are supported by Personal Communications:
  • SysItems
  • Topics
  • Status
  • Formats
  • SysCon
If Personal Communications cannot return the system data items, a DDE ACK message is returned with an error code in the low-order byte of the wStatus word: 
WM_DDE_ACK(wStatus, aSYSITEMS)
Return Code Explanation
9 A system error occurred.